ondblclick onmousemove in Java

Creation Data Matrix in Java ondblclick onmousemove

User first moves the mouse inside the area of an element (fires once) User moves the mouse outside the border of an element

Table 4-3

Applies To window, document, and all visible elements that can receive focus window, document, and all visible elements that can receive focus document and all

User both presses and releases a key (triggers after keydown and keyup events)

Table 4-4

Text-based input, textarea, select elements A form element loses focus and its value has changed User selects text in a text field

when selection action completed Text-based input,

User submits the form (by clicking a Submit button); not triggered when submit is done through a scripting call User or script resets the form

Table 4-5

An image isn t loaded properly or a script error occurs A page loading is stopped before an image has finished loading (little practical use of this event)

Reusing scripts across your site with js files Opening browser windows from a script Executing a script from a link Updating a Web page on the fly Validating form values Scrambling e-mail addresses to avoid spam Testing for features, not for browser type

fter you have a basic introduction to JavaScript, it s time to get practical and apply some of that newfound knowledge to developing scripts for your Web site As you do so, you ll encounter some common tasks that you want to perform using JavaScript Use this chapter as a helpful guide to find helpful tips and techniques as you work on your scripts

You can place all your scripting code for a document inside a script element And, until now in this minibook, that s what we showed you for all the examples However, the script element has an optional src attribute that can reference an external js file A js file is simply a plain-text file that houses JavaScript code Here s a reference to a js file that contains general validity-checking routines for forms:

When the src attribute is present, any code placed between the start and end tags of the script element is ignored

The biggest advantage of placing your script code in js files is that you can then easily reuse the same routines throughout your Web site Suppose that you have a script for creating rollover buttons You can either copy and paste the code throughout your pages or create the code in a single js file and then simply point to the code by using a <script src= /> reference The contents of the js file are pure JavaScript Just as you cannot place HTML elements inside a script tag, you cannot add any markup in an external script file

You may occasionally need to open a new browser window when the user enters your site or performs a specific action You can use JavaScript to create a new browser window by using the window object s open() method The syntax is

windowopen( url , windowName [, featuresList ] )

The url argument is a string specifying the URL to point to The windowName argument is a string literal that is the name to give to the new window You can reference this name elsewhere in your code Here s a basic call to open a new window:

windowopen( http://wwwdigitalwalknet/morehtml , moreWin );

The open() method has a return value that references the new window object that s created Although you don t have to explicitly do anything to the return value, we strongly recommend it Doing so enables you to properly handle references to the new window For example, the following snippet opens a new window and then performs a documentwrite command in the new window:

var moreWindow = windowopen( http://wwwdigitalwalknet/morehtml , moreWin ); moreWindowdocumentwrite( Peek-a-boo I am writing this from a different window );

Never leave the windowName argument as an empty string because different browsers give you different results However, if you re just opening a new, ordinary window, you can just as easily do that without scripting by using a target= _blank attribute on an a link That s why the real power of windowopen() lies in its optional